Company lists · Data refreshed September 2026
Top 25 Mechanical systems integration companies based in Houston, United States
RevenueBase identified 111 mechanical systems integration companies headquartered in Houston, United States as of September 2026 and tracks 5,622 professional contacts across them, including 1,664 with verified work emails. Across the United States, Houston is the largest hub for this category.
This list covers mechanical systems integration companies headquartered in Houston, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest mechanical systems integration companies based in Houston, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,330 contacts → | ||||
Partial evidence “Comfort Systems USA | Quality People.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,183 contacts → | ||||
Indirect evidence “Who We Are Englobal Founded in 1985, ENGlobal (NASDAQ: ENG) is a specialty engineering services firm that focuses on automation solutions and select EPCM projects for the energy…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 3 | 552 contacts → | ||||
Partial evidence “Our expertise encompasses the full spectrum of system technologies from pneumatic - hydraulic control systems to state of the art programmable solutions to chemical injection…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 4 | 251 contacts → | ||||
Partial evidence “Gulfspan Industrial, LLC is a mechanical construction and industrial services company that specializes in performing turnarounds, capital projects, and maintenance.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 5 | 239 contacts → | ||||
Partial evidence “Founded in 1996, Summit Industrial is a Specialty Mechanical Contractor that offers full-service engineering, design-assist and turnkey, direct hire construction services.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 6 | 175 contacts → | ||||
Indirect evidence “Way Engineering's quest for building excellence began in 1918 when a modest, but dedicated refrigeration business opened its doors in Houston, Texas.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 7 | 142 contacts → | ||||
Indirect evidence “VersaTech Automation Services is a 50 year old company with 500+ people and $90M+ in annual sales.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 8 | 115 contacts → | ||||
Indirect evidence “In 1953, James N.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 9 | 87 contacts → | ||||
Strong evidence “We have earned a reputation as a global leader in Design/Build & Systems Integration for more than 30 years.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 10 | 72 contacts → | ||||
Partial evidence “Raven Mechanical, founded 1979, is a full service mechanical contractor specializing in Plumbing and HVAC service and construction.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 11 | 69 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 12 | 64 contacts → | ||||
Partial evidence “Founded in 1974, DWD International designs, manufactures, installs, and maintains industrial HVAC, pressurization, filtration and control systems that can withstand the most…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 13 | 54 contacts → | ||||
Partial evidence “ARC Specialties designs and builds automated manufacturing systems and custom equipment for joining, cladding, and other applications.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 14 | 50 contacts → | ||||
Partial evidence “Founded in 1955, HAR-CON is a full service mechanical contractor well versed in Plumbing and HVAC.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 15 | 45 contacts → | ||||
Indirect evidence “PSI Constructors: Building the Backbone of Industry PSI Constructors specializes in delivering high-quality fabrication, installation, and maintenance solutions for the heavy…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 16 | 42 contacts → | ||||
Partial evidence “As a technology leader and master systems integrator, Convergentz integrates IT and traditional building system functions to improve Building Performance, Environmental Comfort…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 17 | 42 contacts → | ||||
Partial evidence “Way Companies is a full-service commercial and industrial HVACR contractor delivering mechanical design-build, preventative maintenance, emergency service, retrofits, and building…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 18 | 41 contacts → | ||||
Strong evidence “As a leading HVAC retrofit, design, build, and services firm based in Houston, Comfort Systems USA - South Central specializes in installing, maintaining, and upgrading mechanical…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 19 | 40 contacts → | ||||
Partial evidence “Parijat Controlware Inc.(Parijat or PCI) is a controls systems integrator since 1989, has been a strong player in the controls, automation industry.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 20 | 39 contacts → | ||||
Partial evidence “Since RDI Mechanical has been Houston's go-to commercial HVAC and mechanical contractor.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 21 | 30 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 22 | 28 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 23 | 27 contacts → | ||||
Indirect evidence “Rio Marine is a conglomerate of companies and divisions that provides a multitude of services from electrical & hydraulic installation & service, hydraulics cylinders (new &…” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 24 | 22 contacts → | ||||
Partial evidence “Direct Service, Construction & Design provides turnkey mechanical (HVAC), electrical, plumbing (MEP) and general building solutions by way of service, construction and design.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
| 25 | 21 contacts → | ||||
Indirect evidence “Our expertise spans the full range of Process Engineering, Industrial Automation, Turn-Key Engineering Construction Projects, Fabrication, Turnaround and Field Services.” Source: RevenueBase Database · checked Sep 28, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: mechanical systems integration companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names mechanical systems integration companies.
- Partial evidence
- Its own public description names part of mechanical systems integration companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name mechanical systems integration companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 111 mechanical systems integration companies based in Houston, United States
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Mechanical systems integration companies based in Houston, United States at a glance
As of Sep 28, 2026Companies by employee count
Email recency for this list is measured across the whole United States list rather than for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 111 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among mechanical systems integration companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in Houston, United States whose own description of what they do matches “mechanical systems integration companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names mechanical systems integration companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among mechanical systems integration companies, and records with no verified work email. Companies headquartered outside Houston are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 1,664 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 28, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Mechanical systems integration companies by metro in the United States
- Mechanical systems integration companies in New York59
- Mechanical systems integration companies in Indianapolis44
- Mechanical systems integration companies in Miami36
- Mechanical systems integration companies in Phoenix35
- Mechanical systems integration companies in Austin34
- Mechanical systems integration companies in Cincinnati34
- Mechanical systems integration companies in San Diego34
- Mechanical systems integration companies in Louisville33
- Mechanical systems integration companies in Charlotte32
- Mechanical systems integration companies in Atlanta31
- Mechanical systems integration companies in Columbus31
- Mechanical systems integration companies in Grand Rapids28
- Mechanical systems integration companies in Nashville27
- Mechanical systems integration companies in Chicago26
- Mechanical systems integration companies in Rochester26
- Mechanical systems integration companies in Tampa26
- Mechanical systems integration companies in Dallas25
- Mechanical systems integration companies in San Jose25
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names mechanical systems integration companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many mechanical systems integration companies are there based in Houston, United States?
RevenueBase identified 111 mechanical systems integration companies headquartered in Houston, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Comfort Systems USA, headquartered in Houston, tops this list with the largest team on record.
Which city in the United States has the most mechanical systems integration companies?
Houston leads the United States with 111 headquartered companies, followed by New York (59) and Indianapolis (44).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,664 verified decision-maker contacts tracked across these 111 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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